I don’t think it is down to your child theme because as you say, it is literally a blank canvas and has no customization so it’s either our css or Canvas. I am almost certain it’s the later simply because it was working fine before we updated to the new version of Canvas.
I noticed in the changelog it says; ‘New – Tablet responsive breakpoint.’
I am wondering if this has something to do with it.
If you have any suggestions or advice, it would be much appreciated.
I will get let the Woo team know and then wait and see.